Roasting-furnace.



PATENTED JUNE 13, 1905.

F- KLEPETKO.

ROASTING FURNACE.

APPLIOATION FILED D30. 31, 1904.

2 SHEETS-SHEET- 1" El -101M011 No. 792,053. PATENTED JUNE 13, 1905. P. KLEPETKO.

ROASTING FURNACE. APPLICATION FILED DBO. a1. 1904.

2 SHEETS-SHEET 2.

EEE E Patented Tune 13, 1905.

FRANK KLEPETKO, OF NET V YORK, N. Y.

ROASTlNG-FURNACE.

SPECIFICATION forming part of Letters Patent No. 792,053, dated June 13, 1905.

Application filed December 31, 1904. Serial No. 239,207.

To all 2071 0712, it may concern:

Be it known that I, FRANK KLEPETKO, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Roasting-Furnaces, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

My invention has relation to improvements in roasting-furnaces; and it consists in the novel construction and arrangement of parts more fully set forth in the specification, and pointed out in the claims.

In the drawings,-Figure 1 is a vertical central section of a conventional McDougall oreroasting furnace, showing my invention ap plied thereto. Fig. 2 is an enlarged vertical section of the rabble-shaft and arms, showing the cooling mechanism applied thereto. Fig. 3 is a transverse section on line 3 3 of Fig. 2. Fig. i is a vertical sectional detail of a modified construction of. rabble-shaft and arm. Fig. 5 is a cross-section on line 5 5 of Fig. 4. Fig. 6 is a top plan of a rabble-arm, showing an oblique disposition of the ribs. Fig. 7 is a cross-section on line 7 7 of Fig. 6. Fig. 8 is a cross-section of a oylindricalform of arm. Fig. 9 is a crosssection of an arm, showing a part of the ribs disposed on the faces of the trans verse partition thereof. Fig. 10 is a crosssection showing a portion of the ribs disposed on the outer surface of the distributing-pipe leading into the rabble-arm,- and Fig. 11 is a longitudinal vertical section of an arm, showing the ribs made up of a series of sections spaced suitable distances apart.

The present invention is an improvement in air cooling devices for the McDougall or similar type of ore-roasting furnace, being a qualification of the construction shown and described in my United States Patent numbered 779,717, dated January 10, 1905, the patented improvement contemplating gener ically a ribbed construction for the rabblearms carried by the rabble-shaft. The general disposition of the ribs in said patented improvement is shown transverse to the longitudinal axis of the arm, such specific disposition being eminently effective for deflecting the currents of cooling medium traversing said arms. This deflection naturally serves to more or less retard the cooling medium in its passage through the armsan obj ect which while desirable to insure cooling of the arms, yet is one that should not be carried too far, as there would be danger of unduly heating the circulating medium from excessive retardation. So far as the cooling of the rabble-arms is concerned I attain equally as efficient results by the present qualified construction, which while to some extent deflecting andretarding the circulat ing medium, yet permits its passage through the arms and shaft with greater freedom, at the same time insuring a pronounced contact with the arms, as will be better apparent from a detailed description of the invention which is to follow.

Reviewing so much of the description of the furnace as may be essential to a better understanding of the invention, the latter may be described as follows:

Referring to the drawings, F represents the furnace, and h the several hearths in which the material is treated, the said material dropping from the upper hearth successively through the several hearths until it is delivered into the delivery-h0pper O, the hearths being provided, respectively, with the central and marginal openings 1 2 for the passage of the material. Passing through the hearths is the rotatable hollow rabbleshaft 3, from which radiatethe series of hollow arms 4, extending into the several hearths and carrying rakes 5, by which the material is successively fed from one hearth to the hearth immediately beneath, all as fully understood in the art.

Referring again to the drawings, and more particularly to Figs. 1 to 3, inclusive, 6 rep resents an air-feed pipe, preferably stationary, which is located within the shaft, extending to a short distance from the closed bottom of the latter, the lower end of said feed-pipe being open and discharging into the shaft. The pipe receives its supply of air from an extension 6, leading to any suitable blower. (Not shown.) The shaft is divided into a series of chambers or compartments c 7) 0 (Z efg, the chambers being separated from one another by the transverselydisposed division-nalls 7, occupying a plane above the bottoms of the adjacent rabblearms 4-, each chamber having leading therefrom the distributing conduits or pipes 8, which extend into the hollow arms 4 and discharge thercinto. Under this arrangement the air forced and discharged into the bot tom chamber (l passes through the lower sc ries of pipes 8 into the bottom rabble-arms, thence passing into the second chamber 7), and from this through the next series of distributing-pipes and their corresponding rabble-arms, and so on till the current reaches theoutlet-nozzles 9, where it discharges into the atmosphere. As seen from the foregoing, the feed-pipe 6 passes through the several partitions or division-walls 7, and in order that there shall be no leakage at these points a connectingnipple 10 is placed around the pipe where it passes through the partition,

said nipple being turned true and the parti tionv drilled and reamed making a practically air-tight joint.

From the foregoing it will be apparent that the cooling medium must take the course indicated by the arrows andv that a positive and even delivery of cool air will result throughout the entire system of rabblearms. Each rabble-arm must receive its air-current from one chamber before it can deliver it to the next succeeding chamber of the shaft, and the circulation will thus be uniform and positive at all times. In this particular it will make no difference whether the current is introduced through the top or bottom so long as the remaining features of construction are not materially disturbed.

In my patent aforesaid the inner walls of the rabble-arms are provided with rib formations, which are distinctively shown as transverse to the axis of the arm. The purposes of said rib formations are fully set forth in said patent, and while the generic principle providing the rabble-arms with rib formations 1s common to both the construction shown in the patent and to the present qualification of that construction in the latter I dispose the ribs longitudinally and preferably parallel to the longitudinal axis or center of the arm.

()ne of the forms of the new construction is shown in F igs. 1 to 3, inclusive, in which 11 represents a series of parallel longitudinallydlsposcd ribs, with which the inner surface of each rabble-arm is provided, said ribs being formed or cast, preferably, integral with the arm. As the air is discharged from the conduit 8 into the rabble-arm 4 it is split up by the ribs 1. 1. into a series of individual streams confined in the channels 12, separating the ribs, thus exposing more particles of air to a corresponding increased area or surface of contact, and thus more effectively and suddenly cooling the walls of the arms. Once the cooling medium has performed its service it is free to pass onward into and through the rabble-shaft 3 and out through the nozzlcs 9 into the atmosphere.

In. lieu of the conduits 8 I may provide the rabble-arms with horizontal partitions 13, as seen in the modified construction of arms 4 in Figs. 4 and 5, the partitions 13 being con tinuous with the division-walls 13 of the shaft. By terminating the partitions a short distance from the outer ends of the arms I form in the latter two communicating conduits, through which the air is free to circulate. The ribs 11, however, in such modified form are identical with the ribs 11 of the main form already described.

The term longitudinal as herein used is intended to designate any disposition of rib formation which is substantially lengthwise with the arm, though such. disposition may be somewhat oblique to the longitudinal axis of the arm and not necessarily parallel thereto. It is a term as contradistinguished from transverse. Such oblique disposition of ribs 1 have shown in Figs. 6 and 7, where r represents the ribs, and, 0 the rabblearm. While the arm may be of the cross-section shown in Figs. 1 to 7, inclusive, it may be circular, as shown in the form of arm 0 in Fig. 8, (provided with ribs r,) or, in fact, of any convenient form of cross-section. The ribs which in the foregoing views are shown as distributed wholly on the walls of the arm proper maybe partially formed on the partition-wall of the arm, as shown in Fig. 9, (where 19 represents the partition and r the ribs thereon, the arm being designated by 0 and its ribs by r or, as shown in Fig. 10, a portion of the ribs r may be on the pipe 8, the arm 0 being similar to that in Fig. 8.

The designation rib as herein used is most apt for the formation shown, though it is within the spirit of my invention to include any equivalent formation which is capable of splitting up the current traversing the arm into a series of individual streams and. any formation which will offer a larger area of contact to the particles of the cooling medium traversing the arm with. a view of effecting a sudden cooling of the metal of which the arms are constructed. This formation, too, need not necessarily be a single continu ous rib, but may for the length of the arm be formed of a series of sections 1, interrupted at intervals by spaces 8, as shown in the iongitudinal section of rabble-arm 0" in Fig. 11. in fact, the invention is susceptible of va riou s modifications, as apparent to those skilled in the art.

I need not, of course, limit the application of the present furnace to air, as any cooling medium, such as water and the like, may be substituted therefor.

Having described my invention, what I claim is- 1. In a furnace having one or more hearths, a hollow rabble-shaft and hollow arms therefor, and ribs formed on the inner surfaces of the rabble-arms and disposed in a general longitudinal direction therewith, substantially as set forth.

2. In a furnace having one or more hearths, a hollow rabble-shaft and hollow arms therefor, and ribs formed on the inner surfaces of the rabble-arms and disposed substantially parallel to the longitudinal axes of the arms, substantially as set forth.

3. In a furnace having one or more hearths, a hollow rabble-shaft and hollow arms therefor, conduits for directing a current of air from the shaft into the hollow arms, and ribs disposed in the path of the currents traversing said arms, said ribs following the general longitudinal dimensions of said arms, substantially as set forth.

4. In a furnace having one or more hearths, a hollow rabble-shaft and hollow arms therefor, and a series of parallel ribs formed on the inner surfaces of the rabblearms and disposed in a-general longitudinal direction therewith, substantially as set forth.

5. In a furnace, a hollow rabble-arm pro vided with a series of ribs on the inner surface thereof, substantially as set forth.

6. In a furnace, a hollow rabble-arm pro vided with a series of longitudinally-disposed ribs on the inner surface thereof, substantially as set forth.

7. In a furnace, a hollow rabble-arm, means for inducting thereinto a current of cooling medium, and a series of longitudinally-disposed ribs located within the arm in the path of the current traversing the same, substantially as set forth.

8. In a furnace having one or more hearths, a hollow rabble-shaft and hollow arms therefor, and suitable longitudinallydisposed formations within the arms in the path of the currents traversing the same, for splitting up said currents and maintaining them in a series of individual streams, substantially as set forth.

9. In a furnace having one or more hearths, a hollow rabble-shaft and hollow arms therefor, and suitable longitudinallydisposed formations within the arms in the path of the currents traversing the same, for splitting up said currents and maintaining them in a series of longitudinally-disposed individual streams, substantially as set forth.

In testimony whereof I afIiX my signature in presence of two witnesses.

- FRANK KLEPETKO.

WVitnesses:

ANDREW G. GUNBERG, F. E. IVIAROY. 

